alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE [PTsecurity] Win32/Remcos RAT Checkin 51"; flow:established,to_server; stream_size:server,=,1; content:"|4139 2f55 647c c126 8775 8f|"; depth:11; reference:md5,4f3cc55c79b37a52d8f087dbf7093dcd; classtype:command-and-control; sid:2026433; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_10_02, deployment Perimeter, malware_family Remcos, confidence High, signature_severity Major, updated_at 2022_04_18, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)